The TOWIE party girl has announced that she is expecting her first child with her boyfriend of two years– but despite being with Greg for so long, the pregnancy was still a big shock.

In an interview with OK!, the 23-year-old said: "We always spoke about it [having a baby] but it was a shock when it did.

"In my head I knew I was pregnant because I missed my period, which never happens, but I was too nervous to do the pregnancy test because suddenly my whole life was about to change.

"I saw a blue line appear! I called Greg and told him and we just cuddled. Greg cried and I got a lump in the throat."

The beautiful blonde kept the bun in her oven a secret for two whole weeks, saying that the pair were "too in shock" to let anyone know.

PARENTS TO BE: Billie has been dating Greg Shepherd for two years [XPOSURE]

GETTING THE GOSS: Billie takes a sneak peek at Star mag [XPOSURE]

A LITTLE GIRL OR BOY? The sex of the child is unknown [XPOSURE]

The reality TV star, who runs Minnie's Boutique with sister Sam, said: "We didn't tell anyone for two weeks. I invited Sam and my mum round for dinner to tell them but Sam fell asleep on the sofa so it wasn't the right time."

But now the whole family know– and Sam is over the moon that she is going to be an aunt.

Before heading into the CBB house, Sam said: "I cried when Billie told me! It'll be the first baby in our immediate family and my mum is over the moon. She's always said she can't wait to be a nan. The whole family are thrilled."

But while Billie's family and TOWIE pals are rejoicing, the mum-to-be herself is already experiencing some negative side effects to the miracle of pregnancy.

She moaned: "My boobs are so heavy and painful and rock hard, they look fake and they are so painful when I sleep on my front."

Elsewhere in the interview, Billie was quick to shoot down the idea that the TOWIE cameras would be following her into the delivery room.

Billie, who has kept her relationship with Greg off-camera, laughed: "Definitely not! The producers would be like: 'Sorry, can we just hold on for a minute while we set this light up?' It will be the first TOWIE baby but it definitely won't be the first birth on TOWIE."

While baby Faiers won't be making his/her debut on the ITV2 show, Billie's cast mates rushed to Twitter to congratulate their pal on her amazing news.

Jessica Wright tweeted: "Pleased I can now say I'm soooo happy for my lovely @BillieFaiers such amazing news love you lots & lots", while Ferne McCann and Lucy Mecklenburgh also posted their congratulations.

WELCOMING THE NEW TOWIE STAR: Lucy and Ferne rushed to Twitter to voice their excitement [TWITTER]